Blower casing



FIG. 1 is a perspective view of the blower casing in accordance with the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a real elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof wherein the broken lines define portions of the mini fan casing that form no part of the claimed design. 

The ornamental design for blower casing, as shown and described. 